Standard Abrasives 726007, A/O C3 Straight Precision Cartridge Roll, 13/16 in x 2-1/2 in x 1/4 in 80, 7100098783 
Insize 2435-E203, BORE GAGES, measuring depth 30″, range .47-.79″, 6928640391125
$3,612.82
Applicable for .001″ or .0001″ or .00005″ graduation dial indicators.
Carbide contact point and anvil.
Optional accessory: dial indicator or dial comparator, setting ring.
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